Grinding-machine.



PATENTBD APR. 14, 1903.

W. V. ROBINSON. GRINDING MACHINE. APPLICATION FILED MAR, 5, 1902.

2 SHEETS-SHEET 1- NO MODEL.

No. 725,142. PATENTEDAPR. 14, 1903.

W. V. ROBINSON. GRINDING MACHINE.

APPLICATION FILED MAR. 5, 1902. N0 MODEL.

2 SHEETS-SHEET 2.

Metre/a awe/1s- NITFD @TATES WILLIAM V. ROBINSON, OF DETROIT, MICHIGAN.

GRINDHNG-MACHENE.

SPECIFICATION forming part of Letters Patent No. 725,142, dated April14;, 1903.

Application filed March 5, 1902. Serial No. 96,834. (No model.) I

To ttZZ whom it may concern:

Be it known that 1, WILLIAM V. Ronmsou, a citizen of the United States,residing at De troit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Grinding-Machines, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

The invention relates to improvements in grinding-machines; and itconsists in the pe culiar arrangement and combination of parts, as morefully hereinafter described.

In the drawings, Figure 1 is a perspective view of the machine. Fig. 2is a cross-section thereof. Fig. 3 is a plan of a portion of themachine. Fig. 4 is a perspective view of one of the work-holders. Fig. 5is a side elevation. Figs. 6 and 7 are side-and front elevations of thegrinder and guide.

Generally described the machine comprises a work-carrier provided with aseries of holders for securing the work and agrinder which is adapted tobe reciprocated across the path of the carrier, so as to grind thesurface of the casting while traveling by.

The invention has more particular reference to the peculiar constructionof the workcarrier and the holders thereof by means of which thecastings may be quickly engaged and disengaged therefrom; further, inthe means employed for entering the casting beneath the grinder;further, in the means for determining the path through which the grindertravels in its reciprocation.

As shown in the drawings, A is a bed for supporting the work-carrier B.The latter is preferably in the form of an endless chain or belt passingaround the sprocket-wheel C at opposite ends of the bed. Secured to thiscarrier are the work-holders D, preferably constructed as follows: arepresents plates, which are bolted or otherwise secured to links 6 ofthe carrier-chain B. These plates extend across the bed and are providedat opposite ends with hearing feet or flanges 0, adapted to engage withlongitudinal ways (1, secured to the bed. Centrally of the plate a isthe upwardly-extending post 6, which at its upper end'is provided with aslightly-tapering socketf. The construction is such that in the movementof the carrier-chain the holders 1) will be caused to travel over thebed A, the flanges c engaging with the ways cl and being ary bearings.

held thereby tromlateral movement. When the end of the bed is reached,the holders will pass out of engagement with the ways and after passingaround the sprocket C will be returned beneath the bed to the oppositeend thereof.

The grinder comprises an arbor E, journaled in a frame F and havingremovably secured thereto the grinding-wheel G,of any desired shape orconstruction. The frame F is arranged in a substantially horizontalplane and is suspended free to oscillate by means of pivotal hangers H.The arbor E is driven by a belt 1, connecting a pulley J thereon with apulley K upon a shaft K. The latterpreferably forms the pivotalconnection between the frames F and hangers H and is connected throughthe medium of a belt L with a pulley on a shaft M, forming the upperpivot for the hangers H and journaled in suitable station- The frame Fis preferably partially counterbalanced in any suitably way, such as bythe weight N, secured to a lever O, and having the opposite endconnected through the chain P with the frame F.

From the construction just described it will be understood that thegrinding-wheel G will be driven through the belt connections and at thesame time will be free to oscillate across the path of the carrier B andis also free to move vertically. The counterweight connection will holdsaid wheel and the supporting-frame F therefor in substantial balance;but there will be sufficient overweight on the wheel side to cause it topress downward against the surface to be ground.

To reciprocate the frame F, an actuating connection is provided, such asthe pitman Q, connected to one of the hangers H and at its opposite endto a crank R. Thus when motion is imparted to the parts the grinder .Gwill be caused to reciprocate across the path and above the carrier 0,while at the same time motion is imparted to said carrier throughsuitable drive connections, such as S.

The castings to be ground may be secured to the carrierin any suitableway; but in order to permit of quickly engaging and disengaging them Ipreferably provide each with a pair of securing-lugs cast integraltherewith. These lugs are of a size and shape to readily fit in thesockets f of the holders, and when thus engaged will securely hold thecastings upon said carrier while operated upon by the grinder. As thesurfaces to be finished are generally curved, it is necessary to providea grinder-wheel of particular form and also to provide means for guidingsaid Wheel into engagement with the surface of the casting andpreventing it from fouling at the ends or sides, the means employed forguiding the ends of the casting beneath the wheel preferably comprisinga tapering guide T, secured to the frame F at the forward side of thewheel Gr. As shown, this guide is in the form of an inclined member.Thus as the castings are carried forward by the carrier B theysuccessively come in contact with the inclined guide T, and the latterin the reciprocating movement of the frame F will mount up upon saidcasting carrying the grinder-wheel in contact with the surface to be"finished.

In the reciprocating movement of the frame F the grinder-wheel G iscaused to travel through a path substantially corresponding to the crosssection of the casting to be ground. This movement is effected by meansof a cam U, which is bolted to one side of the frame F and is adapted toengage with an antifriction-roll V upon a stationary post V. The cam Uis detachably secured to the frame and may be exchanged whenever theshape of the casting varies. This cam also causes the grinder to clearthe work-holders in the space between the work.

When the castings to be finished are of substantially segmental shape,the guides just described will be sufficient to hold the grinder G inproper relation thereto. With certain classes of work, however, thesurface to be ground is of double curvatureas, for instance, a segmentof a ring of round crosssection. With such a form the cam U would beinefiective in guiding the grinder, as the path through which it musttravel at the ends of the segment is very different from that throughwhich it must travel at the center. Thus if the wheel were only guidedinto contact with the ends of the castings at the center it would fallafter each reciprocation so as to catch with the edge of the castinginstead of mounted thereon. To overcome this difficulty, I preferablyarrange the wings or guide-fingers W before described, which are securedto the frame F upon opposite sides of the periphery of the grinder-wheelG. These fingers or wings are so arranged that when the grinder-wheelpasses off from the surface of the casting at each end of its movementthe fingers will rest upon said casting and prevent the wheel catchingon the edge thereof.

What I claim as my invention is- 1. The combination with ahorizontally-engaging work-carrier, of a rotary grinder journaled invertically-movable bearings, means for reciprocating said grinder acrossthe path of said carrier during the feeding movement thereof, and meansfor first guiding said grinder into contact with the surface of thewhile permitting a limited free movement of said grinder to follow theexact surface of the work.

3. The combination with a work-carrier of a rotary grinder, a movableframe in which said grinder is journaled, means for reciprocating saidframe to carry said grinder across the path of the work, means forsimultaneously yieldingly pressing said grinder toward the work, and apattern-cam for guiding said frame in its reciprocation to move saidgrinder in general conformity to the surface to be ground whilepermitting limited free movement of said grinder to follow the exactsurface of the work.

4:. The combination with a work-carrier of a rotary grinder adapted to.be reciprocated across the path of said carrier, means for yieldinglypressing said grinder toward the work on said carrier, and a guideadjacent and in fixed relation to said grinder, adapted to cause thelatterto mount upon the surface of the work to be ground.

5. The combination with a work-carrier of a rotary grinder adapted to bereciprocated across the path of said carrier and yieldingly pressedtoward the work thereon, and fingers carried with and projecting fromopposite sides of the axis of said grinder adapted to contact with thesurface of the work when the grinder passes beyond the edge thereof, andthereby guide said grinder onto said surface again in its returnmovement.

6. In a grinding-machine, the combination with the grinder of an endlesscarrier, a workholder secured thereto comprising a flanged plate, a postprojecting upward therefrom and having a work-receiving socket at itsupper end, and guideways upon opposite ends of said carrier with whichsaid flanges are adapted to slidingly engage while being fed past saidgrinder.

7. In a grinding-machine, the combination with an endless-chain carrierand guideways upon opposite ends thereof,of the work-holder D comprisingplate a attached to one end of said carrier, the flanges 0 upon oppositesides thereof adapted to slidingly engage with said guideways, and theupwardly-extending post e terminating in the socket fsubstantially asand for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

\(VILLIAM V. ROBINSON.

Witnesses:

M. B. ODOGHERTY, H. 0. SMITH.

